Sometimes a recipe is born of nostalgia. Certainly, this Mushroom Sausage is no exception. This goes all the way back to memories of The Feast of San Gennaro, a week-long festival held in New York’s Little Italy every year. Melissa and I went all the time when we lived there. Now, like every festival or fair, there weren’t exactly many things offered that anyone could consider healthy, but let’s bypass that for the moment… What there was, was a lot of noise, a lot of color and a lot of sausages. At least one vendor on every stretch of the crowded city blocks was selling some kind of sausage, usually…